[kartan]

This technique is akin to hire an artists to draw a high resolution version of your pixelated photos.

A good example of this is "They Of The Tentacle Remastered" (http://dott.doublefine.com/). The new game looks extremely similar to the old one but it has been redrawn.

As some one suggested you should be able to take an old TV show, train the neural network with HD pictures of the cast. And let it redraw it in its own "artistic" interpretation of the images.